From: Hannes Reinecke <h...@suse.com>
Add a new field 'nr_reserved_cmds' to the SCSI host template to
instruct the block layer to set aside a tag space for reserved
commands.
Signed-off-by: Hannes Reinecke <h...@suse.com>
---
drivers/scsi/scsi_lib.c | 1 +
include/scsi/scsi_host.h | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 34eaef631064..e17153a9ce7c 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1842,6 +1842,7 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
shost->tag_set.ops = &scsi_mq_ops;
shost->tag_set.nr_hw_queues = shost->nr_hw_queues ? : 1;
shost->tag_set.queue_depth = shost->can_queue;
+ shost->tag_set.reserved_tags = shost->nr_reserved_cmds;
shost->tag_set.cmd_size = cmd_size;
shost->tag_set.numa_node = NUMA_NO_NODE;
shost->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index a5fcdad4a03e..b094e17ef2d4 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -595,6 +595,12 @@ struct Scsi_Host {
* is nr_hw_queues * can_queue.
*/
unsigned nr_hw_queues;
+
+ /*
+ * Number of reserved commands, if any.
+ */
+ unsigned nr_reserved_cmds;
+
unsigned active_mode:2;
unsigned unchecked_isa_dma:1;
--
2.16.4
